/*
silverPDF is sponsored by Aleyant Systems (http://www.aleyant.com)

silverPDF is based on PdfSharp (http://www.pdfsharp.net) and iTextSharp (http://itextsharp.sourceforge.net)

Developers: Ai_boy (aka Oleksii Okhrymenko)

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above information and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR SPONSORS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

*/
#region PDFsharp - A .NET library for processing PDF
//
// Authors:
//   Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Diagnostics;
using System.Collections;
using System.Text;
using System.IO;
using PdfSharp.Drawing;
using PdfSharp.Internal;
using PdfSharp.Fonts;
using PdfSharp.Fonts.TrueType;
using PdfSharp.Pdf.Advanced;
using PdfSharp.Pdf.Filters;

namespace PdfSharp.Pdf.Advanced
{
  /// <summary>
  /// Represents a composite font. Used for Unicode encoding.
  /// </summary>
  internal sealed class PdfType0Font : PdfFont
  {
    public PdfType0Font(PdfDocument document)
      : base(document)
    {
    }

    public PdfType0Font(PdfDocument document, XFont font)
      : base(document)
    {
      Elements.SetName(Keys.Type, "/Font");
      Elements.SetName(Keys.Subtype, "/Type0");
      Elements.SetName(Keys.Encoding, "/Identity-H");

      TrueTypeDescriptor ttDescriptor = (TrueTypeDescriptor)FontDescriptorStock.Global.CreateDescriptor(font);
      this.fontDescriptor = new PdfFontDescriptor(document, ttDescriptor);
      this.fontOptions = font.PdfOptions;
      Debug.Assert(this.fontOptions != null);

      this.cmapInfo = new CMapInfo(ttDescriptor);
      this.descendantFont = new PdfCIDFont(document, this.fontDescriptor, font);
      this.descendantFont.CMapInfo = this.cmapInfo;

      // Create ToUnicode map
      this.toUnicode = new PdfToUnicodeMap(document, this.cmapInfo);
      document.Internals.AddObject(toUnicode);
      Elements.Add(Keys.ToUnicode, toUnicode);

      //if (this.fontOptions.BaseFont != "")
      //{
      //  BaseFont = this.fontOptions.BaseFont;
      //}
      //else
      {
        BaseFont = font.Name.Replace(" ", "");
        switch (font.Style & (XFontStyle.Bold | XFontStyle.Italic))
        {
          case XFontStyle.Bold:
            this.BaseFont += ",Bold";
            break;

          case XFontStyle.Italic:
            this.BaseFont += ",Italic";
            break;

          case XFontStyle.Bold | XFontStyle.Italic:
            this.BaseFont += ",BoldItalic";
            break;
        }
      }
      // CID fonts are always embedded
      BaseFont = PdfFont.CreateEmbeddedFontSubsetName(BaseFont);

      this.fontDescriptor.FontName = BaseFont;
      this.descendantFont.BaseFont = BaseFont;

      PdfArray descendantFonts = new PdfArray(document);
      Owner.irefTable.Add(descendantFont);
      descendantFonts.Elements.Add(descendantFont.Reference);
      Elements[Keys.DescendantFonts] = descendantFonts;
    }

    public PdfType0Font(PdfDocument document, string idName, byte[] fontData)
      : base(document)
    {
      Elements.SetName(Keys.Type, "/Font");
      Elements.SetName(Keys.Subtype, "/Type0");
      Elements.SetName(Keys.Encoding, "/Identity-H");

      TrueTypeDescriptor ttDescriptor = (TrueTypeDescriptor)FontDescriptorStock.Global.CreateDescriptor(idName, fontData);
      this.fontDescriptor = new PdfFontDescriptor(document, ttDescriptor);
      this.fontOptions = new XPdfFontOptions(PdfFontEncoding.Unicode, PdfFontEmbedding.Always);
      Debug.Assert(this.fontOptions != null);

      this.cmapInfo = new CMapInfo(ttDescriptor);
      this.descendantFont = new PdfCIDFont(document, this.fontDescriptor, fontData);
      this.descendantFont.CMapInfo = this.cmapInfo;

      // Create ToUnicode map
      this.toUnicode = new PdfToUnicodeMap(document, this.cmapInfo);
      document.Internals.AddObject(toUnicode);
      Elements.Add(Keys.ToUnicode, toUnicode);

      BaseFont = ttDescriptor.FontName.Replace(" ", "");
        //switch (font.Style & (XFontStyle.Bold | XFontStyle.Italic))
        //{
        //  case XFontStyle.Bold:
        //    this.BaseFont += ",Bold";
        //    break;

        //  case XFontStyle.Italic:
        //    this.BaseFont += ",Italic";
        //    break;

        //  case XFontStyle.Bold | XFontStyle.Italic:
        //    this.BaseFont += ",BoldItalic";
        //    break;
        //}

      // CID fonts are always embedded
      if (!BaseFont.Contains("+"))  // HACK
        BaseFont = PdfFont.CreateEmbeddedFontSubsetName(BaseFont);

      this.fontDescriptor.FontName = BaseFont;
      this.descendantFont.BaseFont = BaseFont;

      PdfArray descendantFonts = new PdfArray(document);
      Owner.irefTable.Add(descendantFont);
      descendantFonts.Elements.Add(descendantFont.Reference);
      Elements[Keys.DescendantFonts] = descendantFonts;
    }

    XPdfFontOptions FontOptions
    {
      get { return this.fontOptions; }
    }
    XPdfFontOptions fontOptions;

    public string BaseFont
    {
      get { return Elements.GetName(Keys.BaseFont); }
      set { Elements.SetName(Keys.BaseFont, value); }
    }

    internal PdfCIDFont DescendantFont
    {
      get { return this.descendantFont; }
    }
    PdfCIDFont descendantFont;

    internal override void PrepareForSave()
    {
      base.PrepareForSave();

      TrueTypeDescriptor descriptor = (TrueTypeDescriptor)this.fontDescriptor.descriptor;
      bool symbol = descriptor.fontData.cmap.symbol;
      StringBuilder w = new StringBuilder("[");
      if (this.cmapInfo != null)
      {
        char[] chars = this.cmapInfo.Chars;
        int count = chars.Length;
        // We don't care about char that share the same glyph
        int[] glyphIndices = new int[count];
        int[] glyphWidths = new int[count];

        for (int idx = 0; idx < count; idx++)
        {
          char ch = chars[idx];
          int glyphIndex;
          if (symbol)
          {
            glyphIndex = (int)ch + (descriptor.fontData.os2.usFirstCharIndex & 0xFF00);
            glyphIndex = descriptor.CharCodeToGlyphIndex((char)glyphIndex);
          }
          else
            glyphIndex = descriptor.CharCodeToGlyphIndex(ch);

          descriptor.CharCodeToGlyphIndex(chars[idx]);
          glyphIndices[idx] = glyphIndex;
          glyphWidths[idx] = descriptor.GlyphIndexToPdfWidth(glyphIndex);
        }

        //TODO: optimize order of indices

        for (int idx = 0; idx < count; idx++)
          w.AppendFormat("{0}[{1}]", glyphIndices[idx], glyphWidths[idx]);
        w.Append("]");
        this.descendantFont.Elements.SetValue(PdfCIDFont.Keys.W, new PdfLiteral(w.ToString()));
      }

      this.descendantFont.PrepareForSave();
      this.toUnicode.PrepareForSave();
    }

    /// <summary>
    /// Predefined keys of this dictionary.
    /// </summary>
    public new sealed class Keys : PdfFont.Keys
    {
      /// <summary>
      /// (Required) The type of PDF object that this dictionary describes;
      /// must be Font for a font dictionary.
      /// </summary>
      [KeyInfo(KeyType.Name | KeyType.Required, FixedValue = "Font")]
      public new const string Type = "/Type";

      /// <summary>
      /// (Required) The type of font; must be Type0 for a Type 0 font.
      /// </summary>
      [KeyInfo(KeyType.Name | KeyType.Required)]
      public new const string Subtype = "/Subtype";

      /// <summary>
      /// (Required) The PostScript name of the font. In principle, this is an arbitrary
      /// name, since there is no font program associated directly with a Type 0 font
      /// dictionary. The conventions described here ensure maximum compatibility
      /// with existing Acrobat products.
      /// If the descendant is a Type 0 CIDFont, this name should be the concatenation
      /// of the CIDFont�s BaseFont name, a hyphen, and the CMap name given in the
      /// Encoding entry (or the CMapName entry in the CMap). If the descendant is a
      /// Type 2 CIDFont, this name should be the same as the CIDFont�s BaseFont name.
      /// </summary>
      [KeyInfo(KeyType.Name | KeyType.Required)]
      public new const string BaseFont = "/BaseFont";

      /// <summary>
      /// (Required) The name of a predefined CMap, or a stream containing a CMap
      /// that maps character codes to font numbers and CIDs. If the descendant is a
      /// Type 2 CIDFont whose associated TrueType font program is not embedded
      /// in the PDF file, the Encoding entry must be a predefined CMap name.
      /// </summary>
      [KeyInfo(KeyType.StreamOrName | KeyType.Required)]
      public const string Encoding = "/Encoding";

      /// <summary>
      /// (Required) A one-element array specifying the CIDFont dictionary that is the
      /// descendant of this Type 0 font.
      /// </summary>
      [KeyInfo(KeyType.Array | KeyType.Required)]
      public const string DescendantFonts = "/DescendantFonts";

      /// <summary>
      /// ((Optional) A stream containing a CMap file that maps character codes to
      /// Unicode values.
      /// </summary>
      [KeyInfo(KeyType.Stream | KeyType.Optional)]
      public const string ToUnicode = "/ToUnicode";

      /// <summary>
      /// Gets the KeysMeta for these keys.
      /// </summary>
      internal static DictionaryMeta Meta
      {
        get
        {
          if (Keys.meta == null)
            Keys.meta = CreateMeta(typeof(Keys));
          return Keys.meta;
        }
      }
      static DictionaryMeta meta;
    }

    /// <summary>
    /// Gets the KeysMeta of this dictionary type.
    /// </summary>
    internal override DictionaryMeta Meta
    {
      get { return Keys.Meta; }
    }
  }
}
